Energy Fuels, 2013, 27 (8), pp 4617–4623, DOI: 10.1021/ef401015c
Deep Desulfurization of Fuels by Extraction with
4-Dimethylaminopyridinium-Based Ionic Liquids
Abstract
Qianli Wang , Lecheng Lei , Jingke Zhu , Bin Yang , and Zhongjian Li *
zdlizj@zju.edu.cn
Key Laboratory of Biomass Chemical Engineering of Ministry of Education,
Department of Chemical and Biological Engineering, Zhejiang University, Yuquan
Campus, Hangzhou 310027, China
Abstract
Researchers show that synthesized three
4-dimethylaminopyridinium-based ionic liquids (ILs),
N-ethyl-4-dimethylaminopyridinium dicyanamide ([C24DMAPy][N(CN)2]),
N-butyl-4-dimethylaminopyridinium dicyanamide ([C44DMAPy][N(CN)2])
and N-hexyl-4-dimethylaminopyridinium dicyanamide ([C64DMAPy][N(CN)2])are
efficient for aromatic sulfur compounds extraction from fuels.
Study results suggested that
4-dimethylaminopyridinium-based ILs hardly dissolved in the fuels, while the
solubility of 97# gasoline in ILs varies from 7.0 wt % for [C24DMAPy][N(CN)2]
to 12.4 wt % for [C64DMAPy][N(CN)2] and the
solubility of 0# diesel in ILs varies from 6.7 wt % for [C24DMAPy][N(CN)2]
to 9.7 wt % for [C64DMAPy][N(CN)2].
The sulfur partition coefficient was examined, as well. In the case of model
gasoline, the thiophene (TS) partition coefficient in model gasoline varies
from 0.885 for [C24DMAPy][N(CN)2] to 1.218 for
[C64DMAPy][N(CN)2]. In the case of model
diesel, 4-dimethylaminopyridinium-based ILs exhibit a relatively higher sulfur
partition coefficient, compared to alkyl modified pyridinium-based ILs. 1H
NMR results confirmed that the high aromatic π-electron density of the
dimethylaminopyridinium cation was the main cause of the good extraction
performance. 1H NMR results also confirmed the KN
sequence for each IL ([C24DMAPy][N(CN)2] <
[C44DMAPy][N(CN)2] < [C64DMAPy][N(CN)2])
is mainly due to the sulfur compounds and ILs structures. Furthermore, the
extractive selectivity results indicated a more preferable extraction of TS
than toluene with 4-dimethylaminopyridinium-based ILs.
Full Text Source (Subscription or Fee): http://pubs.acs.org/doi/abs/10.1021/ef401015c
No comments:
Post a Comment